Steam-engine valve



S. ROSENZWEiG.

STEAM ENGINE VALVE. APPLICATION FILED NOV. 11. 1919.

Patented June 14, 1921.

. awwwboi x5 659/20 Fa SEA/Z W516 SIEGFRIED EOSENZWEIG, OF NEW YQEK, N. Y.

STEAM-ENGINE VALVE.

Application filed November To all whom it may concern:

Be it known that I, Srnornrnn Rosnnzwnro, citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Steam- Engine Valves, of which the following is a specification.

This invention relates to engines and has particular reference to a novel valve mechanism for the fluid distribution to the cylinders of locomotives, marine and stationary engines, ammonia engines and compressors.

The primary object of this invention is to provide a new valve arrangement of the puppet valve type that is readily applicable to engines of the character set forth and in volves the provision of novel means for guiding and positioning the valves onto the valve seats as they are alternately raised and lowered by the action of the cam.

A further object of the invention is to provide improved guide means for the valves whereby the valve stem is given a maximum support throughout its length thereby pr venting in a very practical way the canting of the valves on the seats.

A still further object of this invention is to reduce the cylinder clearance to a minimum, and make the inlet and exhaust valves as small as practicable, and to so arrange the said inlet and exhaust valves that the cam shaft which actuates the same is positioned to one side of the valves thus allowing both valves to be moved by a common actuating cam.

With these and other objects in view which will be more readily apparent as the nature of the invention is better understood, the same consists in the novel construction, combination and arrangement of parts hereinafter more fully pointed out, illustrated and claimed.

It will be obvious to those skilled in the art to which this invention belongs that the same is susceptible to considerable struc tural change and modification without departing from the spirit or scope ofthe invention, but a practical arrangement as applied to a steam locomotive is shown in the accompanying drawings, in which:

Figure 1 is a cross sectional view of an exhaust valve, steam valve, and valve cage,

Specification of Letters Patent.

Patented June 14-, 1921. 17, 1919. Serial No. eeaeve.

as applied to a steam locomotive showing e relative location of the cam shaft to each of the valves.

Fig. 2 is a longitudinal sectional a steam locomotive cylinder having proved puppet valves applied thereto.

Slmilar reference numerals refer to similar parts throughout the figures of the drawlngs. J1 Incarrying the present invention into efrect it is proposed to provide a novel valve unit of the puppet valve type for control ling the admission of live to the cylinders and the exhaust therefrom. Accordingly, as will be observed from the drawings it is intended to mount the novel valve within the steam chest above the cylinder 1 in such a manner that the port 2 thereof may be controlled directly by the valve unit which is preferably disposed transversely to the longitudinal axis of the cylinder and therefore accessible laterally from the side of the steam chest designated generally S.

One of the novel and distinctive features of the invention is the provision of the valve unit which may be easily and quickly assembled within the chest, and to this end it is proposed to provide a suitable abutment 3 inside of the steam chest in the form of an annular shoulder or ring with which a part of the valve cage Q may engage for the purpose of holding it in position. That is to say it is proposed to utilize an abutment on the exhaust side of the steam chest for the purpose of holding an exhaust seat ring 4 in position, said exhaust ring 4 being a part of the valve cage C and adapted to be held in position against the abutment 3 by means of the said valve cage C which is preferably insertible and removable as a unit through the lateral opening in the' steam chest S. For the purpose of holding the valve casting 5 in its assembled position the cover for the access opening may be provided with the arms 7 projecting from one side thereof as shown in Fig. 1 of the drawings. With this arrangement it will be apparent that the valve casting 5 and seat ring 4 whether separate parts or secured together may be easily and quickly positioned within the steam chest by the placing of the cover 6 in position.

The valve cage 0 divides the interior of view of seat ring the steam chest into the live steam compartment or chamber A and the exhaust compartment or chamber B, and as usual the live steam compai ment A communicates with the boiler through the opening A while the exhaust chamber l3 communicates with the atmosphere in the conventional manner.

Referring now particularly to the novel construction of he valve unit it will be observed that the valve casting or body 5 includes the opposite side wall members 8 and 9, the former being adjacent the exhaust 4t and having an opening E therein to register with the opening of the exhaust seat ring, while the latter is provided with an intake opening 10 and formed on its outer side with an intake valve seat 11. The intermediate ortion of the valve castin orbod b 5 is formed with a de iending wall or web 12 having a right angularly disposed valve stem guide sleeve 13 whi h is preferably hollow as clearly shown in Fig. 1 of the drawings. This hollow guide sleeve 13 therefore extends to opposite sides of the intermediate web or wall 12 and through the intake and exhaust openings of the walls 8 and 9. Theportion of the guide sleeve 13 which projects through the intake opening 10 is adapted to telescopically receive the hollow stem 14 of an intake valve 15 in such a manner that the edge 16 thereof cooperates with the seat 11 to normally close the intake port- 10. In a somewhat similar manner, the opposite portion of the guide sleeve 13, which extends through the exhaust opening in the wall 8, receives the hollow stem portion 1'? of an exhaust valve 18 whose edge portion 19 cooperates with the seat ring 1 to close the exhaust opening E in the wall 8.

Both the intake valve 15 and the exhaust valve 18 are maintained in their seated position by means of suitable springs, and are therefore unseated against spring tension. As will be observed from Fig. 1 the spring 20 confined between the cap 21 of the valve 18 and the fixed abutment wall 22 of the steam chest serves to place the exhaust valve under spring tension, while the spring 23 confined between a portion of the valve 15 and the adjustable plug 24 in the cover 6 of the steam chest serves to perform a similar function for the intake valve.

llor the purpose of operating the valves against the tension of the springs 20 and 23 to unseat the same,novel operating means is provided. That is to say, the stem portion 17 of the exhaust valve 18 has mounted therein a roller 25, while the stem portion 14 of the intake valve 15 has fitted thereto a stem extension or push rod 26 which is slidably mounted in the hollow guide sleeve 13 and carries at one end thereof a roller 27. Between the rollers 25 and 27 it is proposed to operate a suitably formed cam 28. his

cam 28 is preferably a part of a shaft 29 adapted to reciprocate longitudinally within the steam chest and at right angles to the stems of the valves 15 18 whereby its movement will, at the proper time, cause the rollers 25 and 27 to be driven in opposite directions to alternately seat and unseat the valves 15 and 18.

For the purpose of reciprocating the cam shaft 29 it is preferred to use some form of outsidevalve gear, and to this end there is shown in the drawings a portion of a well known outside gear which includes a lap and lead lever 30 with the radius rod 31 attached to the topmost end, as is usual with locomotives having piston valves with inside steam admission. ssociated with the lap and lead lever 39 is a valve stem cross-head 32 to which is attached in the usual manner the cam shaft 29 by means of the pin 33 or the like. The end f the cam shaft 29 adjacent the cross-head 32 works through a suitable packing gland 34: and stuffing box 35 to prevent leakage of steam from the steam chest.

From the foregoing it will be apparent that this form of the invention provides a novel valve unit of the puppet valve type for controlling the admission and exhaust of steam to the cylinder. The particular arrangement shown and described is not only capable of facile assembly, but at the same time the compact nesting and arrangement of the valve stems and the means for operating the same, prevents the valves from canting and holds them to a true seat.

Furthermore the idea of providing a removable valve cage for a valve of the puppet type is adhered to, the said valve cage being held in position by a removable cover which may constitute a spring abutment for seating the valve, as well as performing the function of holding the cage in position in the steam chest. Also, the idea of a valve having a double seat and a relatively long stem for preventing canting of the valve with reference to the seat is also regarded as a feature ofspecial importance in the present invention.

Without further description it is thought that the many advantages will be apparent to those skilled in the art, and it will of course be understood that changes in the form, proportion and details of construction may be resorted to without departing from the spririt of the invention or scope of the appended claim.

I claim V A puppet valve construction for steam locomotives including in combination with the steam chest, a valve cage consisting of a substantially inverted Ushaped member having intake and exhaust ports in the opposite wings thereof and also having a single intermediate wall provided with a right angularly disposed valve stem guide sleeve, a spring pressed valve having a tubular stem portion fitting over the exterior of the guide sleeve a push rod arranged within the said guide sleeve and engaging with the said valve at one end while the opposite end projeots beyond the opposite end of the guide sleeve, another spring pressed valve having a stem portion provided with an opening and also adapted to en age with the exterior of the sleeve guide at one side of the inter- In testimony whereof I hereunto affix my signature in the presence of two witnesses.

SIEGFRIED ROSENZWVEIG. Witnesses:

E. L. SRoFF, E. N. TOMPKINS. 

